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galaxy

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias (γαλαξίας), literally "milky", a reference to the Milky Way. Galaxies range in size from dwarfs with just a few hundred million (108) stars to giants with one hundred trillion (1014) stars, each orbiting its galaxy's center of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. Many galaxies are thought to have black holes at their active centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As of March 2016, GN-z11 is the oldest and most distant observed galaxy with a comoving distance of 32 billion light-years from Earth, and observed as it existed just 400 million years after the Big Bang. Recent estimates of the number of galaxies in the observable universe range from 200 billion (2×1011) to 2 trillion (2×1012) or more, containing more stars than all the grains of sand on planet Earth. Most of the galaxies are 1,000 to 100,000 parsecs in diameter and separated by distances on the order of millions of parsecs (or megaparsecs). The space between galaxies is filled with a tenuous gas having an average density of less than one atom per cubic meter.
Galaxy wow - galaxy on litters
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Galaxy wow

Added 12 days ago by MAJAMA

21

nebulosa - nebulosa del granchio
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nebulosa

Added year ago by carla

164

galaxy tree - The picture shows a tree against the background of the night sky
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galaxy tree

Added year ago by Lil

116 1

Swinica at night - A keystone in the main ridge of the High Tatras with two peaks, varying in height by 10 m. The shape
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Swinica at night

Added year ago by aldona

116 1

granatowe niebo - granatowe niebo, blyskawica
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granatowe niebo

Added year ago by Iwona

106

zorza polarna - niebo,gwiazdy,kolory,zorza
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zorza polarna

Added year ago by wieslawa

163

Dziewczyna z anime - Dziewczyna z długimi włosami
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Dziewczyna z anime

Added over a year ago by Weronika

1

już niebawem - pada,śnieg,biały auta
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już niebawem

Added over a year ago by wieslawa

91

Purple Sky - Purple Sky Wallpaper
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Purple Sky

Added over a year ago by angel

2

Manga Anime - Manga Anime Ładny Obrazek
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Manga Anime

Added over a year ago by Weronika

2

giuvan palestin - immensità dello spazio, stelle e quanto ltro
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giuvan palestin

Added over a year ago by giuvuan

43

galaktyczne puzzle! - śliczne zdięcie (chyba zdięcie)
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galaktyczne puzzle!

Added over a year ago by Galaxy :3

217

Mgławica Kraba - Zdjęcia z teleskopu Huble'a
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Mgławica Kraba

Added over a year ago by 123456789

106

Winx Club - Winx Club: Tecna Transformacja Charmix
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Winx Club

Added over a year ago by Natalia Wolanin

52

Dziewczyna z anime - Ładna dziewczyna z długimi włosami
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Dziewczyna z anime

Added over a year ago by Weronika

5

Manga Anime - Ładne kocie oczy i księżyc
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Manga Anime

Added over a year ago by Weronika

9

gwiaździste niebo, wulkan - gwiaździste niebo, wulkan, skały
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gwiaździste niebo, wulkan

Added over a year ago by Jasmina

153